<template>
	<div>
		<!-- 面包屑导航区 -->
		<el-breadcrumb separator="/">
		<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
		<el-breadcrumb-item>商品管理</el-breadcrumb-item>
		<el-breadcrumb-item>添加商品</el-breadcrumb-item>
		</el-breadcrumb>
		<!-- 卡片视图 -->
		<el-card>
			<!-- 提示区域 -->
			<el-alert title="添加商品信息"
			type="info" center show-icon @closable="false"></el-alert>
		
		<!-- 步骤条 -->
			<el-steps :space="200" :active="activeIndex - 0"
			 finish-status="success" align-center>
			<el-step title="基本信息"></el-step>
			<el-step title="商品参数"></el-step>
			<el-step title="商品属性"></el-step>
			<el-step title="商品图片"></el-step>
			<el-step title="商品内容"></el-step>
			<el-step title="完成"></el-step>
			</el-steps>
			<!-- tab栏区域 -->
			<el-form :model="addForm" :rules="addFormRules"
			 ref="addFormRef" label-width="100px" 
			 label-position="top">
			<el-tabs :tab-position="'left'" v-model="activeIndex"
			:before-leave="beforeTabLeave" @tab-click="tabClick">
			   <el-tab-pane label="基本信息" name="0">基本信息
					<el-form-item label="商品名称" prop="goods_name">
						<el-input v-model="addForm.goods_name"></el-input>
					</el-form-item>
					<el-form-item label="商品价格" prop="goods_price">
						<el-input v-model="addForm.goods_price"
						type="number"></el-input>
					</el-form-item>
					<el-form-item label="商品重量" prop="goods_weight">
						<el-input v-model="addForm.goods_weight"
						type="number"></el-input>
					</el-form-item>
					<el-form-item label="商品数量" prop="goods_number">
						<el-input v-model="addForm.goods_number"
						type="number"></el-input>
					</el-form-item>
					<el-form-item label="商品分类" prop="goods_cat">
						 <el-cascader
						    v-model="addForm.goods_cat"
						    :options="catelist"
						    :props="cateProps"
						    @change="handleChange"></el-cascader>
					</el-form-item>
			   </el-tab-pane>
			   <el-tab-pane label="商品参数" name="1"> 
				   <!-- 渲染表单的Item项：动态参数 -->
				   <el-form-item v-for="item in manyTableData"
				   :key="item.attr_id" :label="item.attr_name">
					   <!-- 复选框组 -->
					   <el-checkbox-group v-model="item.attr_vals">
						   <el-checkbox :label="cb" v-for="(cb,i) in 
						   item.attr_vals" :key="i" border></el-checkbox>
					   </el-checkbox-group>
				   </el-form-item>
			   </el-tab-pane>
			   <!-- 渲染表单的Item项：静态属性 -->
			   <el-tab-pane label="商品属性" name="2">
			   <el-form-item :label="item.attr_name" v-for="item in onlyTableData"
			   :key="item.attr_id">
				<el-input v-model="item.attr_vals"></el-input>
			   </el-form-item>
			   </el-tab-pane>
			   <el-tab-pane label="商品图片" name="3">
				  	<!-- action:表示图片要上传到的后台api地址 -->
					<el-upload
					  :action="uploadURL"
					  :on-preview="handlePreview"
					  :on-remove="handleRemove"
					  list-type="picture"
					  :headers="headerObj"
					  :on-success="handleSuccess">
					  <el-button size="small" type="primary">
						点击上传</el-button>
					</el-upload>
				</el-tab-pane>
			   <el-tab-pane label="商品内容" name="4">
				   <!-- 富文本编辑器 -->
				   <quill-editor v-model="addForm.goods_introduce"
				   ></quill-editor>
				   <!-- 添加商品的按钮 -->
				   <el-button class="btnAdd" type="primary"
				   @click="add">添加商品</el-button>
				 </el-tab-pane>
			 </el-tabs>
			 </el-form>
		</el-card>
		<!-- 图片预览区域 -->
		<el-dialog title="图片预览"
		:visible.sync="previewVisible" 
		width="50%" >
		<img :src="previewPath" alt="" class="previewImg">
		</el-dialog>
	</div>
</template>

<script>
import _ from 'lodash'

export default {
	data() {
		return {
			activeIndex: '0',
			addForm: {
				goods_name: '',
				goods_price: 0,
				goods_weight: 0,
				goods_number: 0,
				// 商品所属的分类数组
				goods_cat: [],
				//图片的数组
				pics: [],
				//商品的详情描述
				goods_introduce: '',
				attrs: []
			},
			addFormRules: {
				goods_name: [
					{ required: true, message:"请输入商品名称",
					 trigger: 'blur'}],
				goods_price: [
					{ required: true, message:"请输入商品价格",
					 trigger: 'blur'}],
				goods_weight: [
					{ required: true, message:"请输入商品重量",
					 trigger: 'blur'}],
				goods_number: [
					{ required: true, message:"请输入商品数量",
					 trigger: 'blur'}],
				goods_cat: [
					{ required: true, message:"请选择商品分类",
					 trigger: 'blur'}]	
			},
			catelist: [],
			cateProps: {
				expandTrigger: 'hover',
				label: 'cat_name',
				value: 'cat_id',
				children: 'children'
			},
			//动态参数列表数组
			manyTableData: [],
			onlyTableData: [],
			// 上传图片URL的地址
			uploadURL:
			 'http://127.0.0.1:8888/api/private/v1/upload',
			 // 图片上传组件的header请求头对象
			 headerObj: {
				 Authorization: 
				 window.sessionStorage.getItem('token')
			 },
			 previewPath: '',
			 previewVisible: false
		}
	},
	created() {
		this.getCateList()
	},
	methods: {
		async getCateList() {
			const {data: res } = await this.$http.get(
			'categories')
			if(res.meta.status !== 200) {
				return this.$message.error('获取商品分类数据失败')
			}
			//this.$message.success('获取商品分类数据成功')
			this.catelist = res.data 
			//console.log(this.catelist)
		},
		//级联选择器触发函数
		handleChange() {
			if(this.addForm.goods_cat.length !== 3) {
				this.addForm.goods_cat = [] 
			}
		},
		beforeTabLeave(activeName,oldActiveName) {
			// console.log('即将离开的标签页名称是：' + 
			// oldActiveName)
			// console.log('即将进入的标签页名称是：' +
			// activeName)
			if(oldActiveName === '0' && this.addForm.goods_cat
			.length !== 3){
				this.$message.error('请先选择商品分类')
				return false
			}
			
		},
		async tabClick() {
			// 访问的事参数面板
			if(this.activeIndex === '1') {
				const {data: res} = await this.$http.get(
				`categories/${this.cateId}/attributes`,
				{ params: {
					sel: 'many'
				}})
				if(res.meta.status !== 200) {
					return this.$message.error('获取动态参数列表失败')
				}
				res.data.forEach(item => {
					item.attr_vals =
					item.attr_vals.length === 0 ? []:
					item.attr_vals.split(' ')
				})
				this.manyTableData = res.data
			}
			if(this.activeIndex === '2') {
				const {data: res} = await this.$http.get(
				`categories/${this.cateId}/attributes`,
				{ params: {
					sel: 'only'
				}})
				if(res.meta.status !== 200) {
					return this.$message.error('获取静态属性列表失败')
				}
				this.onlyTableData = res.data
			}
		},
		// 处理图片预览效果
		handlePreview(file) {
			this.previewPath = file.response.data.url
			this.previewVisible = true
		},
		handleRemove(file) {
			// 获取将要删除图片的临时路径
			const filePath = 
			file.response.data.tmp_path
			//从pics数组中找到对应索引值
			const i = this.addForm.pics.findIndex(x => 
			x.pic === filePath)
			//调用splice删除
			this.addForm.pics.splice(i, 1)
			console.log(this.addForm)
		},
		// 监听图片上成功的事件
		handleSuccess(response) {
			//console.log(response)
			//1.拼接得到一个图片信息对象
			const picInfo = { 
				pic: response.data.tmp_path
			}
			//2.将图片信息对象push到到pics数组中
			this.addForm.pics.push(picInfo)
		},
		add() {
			this.$refs.addFormRef.validate(async valid => {
				if(!valid) {
					return this.$message.error(
					'请填写必要的表单相')
				}
				// 执行添加的业务逻辑,join返回字符串
				const form = _.cloneDeep(this.addForm)
				form.goods_cat = form.goods_cat.join(',')
				//处理动态参数和静态属性
				this.manyTableData.forEach(item => {
					const newInfo = {
						attr_id: item.attr_id,
						attr_value: item.attr_vals.join(' ')
					}
					this.addForm.attrs.push(newInfo)
				})
				//处理静态属性
				this.onlyTableData.forEach(item => {
					const newInfo = {
						attr_id: item.attr_id,
						attr_value: item.attr_vals,
					}
					this.addForm.attrs.push(newInfo)
					
				})
				form.attrs = this.addForm.attrs
				console.log(form)
				//发起请求添加商品
				//商品的名称，必须是唯一的
				const { data: res } = await this.$http.post(
				'goods', form)
				
				if(res.meta.status !== 201) {
					return this.$message.error('添加商品成功')
				}
				this.$message.success('添加商品成功')
				this.$router.push('/goods')
			})
		}
	},
	computed: {
		cateId() {
			if(this.addForm.goods_cat.length === 3) {
				return this.addForm.goods_cat[2]
			}
			return null
		}
	}
}
</script>

<style lang="less" scoped>
.el-checkbox {
	margin-right: 5px !important;
}
.previewImg {
	width: 100%;
}
.btnAdd {
	margin-top: 10px;
}
</style>
